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Extreme Phenotypic Plasticity in Metabolic Physiology of Antarctic Demosponges

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Extreme Phenotypic Plasticity in Metabolic Physiology of Antarctic Demosponges ORIGINAL RESEARCH published: 22 January 2016 doi: 10.3389/fevo.2015.00157 Extreme Phenotypic Plasticity in Metabolic Physiology of Antarctic Demosponges Simon A. Morley 1*, Jade Berman 1, 2, David K. A. Barnes 1, Carlos de Juan Carbonell 1, Rachel V. Downey 1, 3 and Lloyd S. Peck 1 1 British Antarctic Survey, Natural Environment Research Council, Cambridge, UK, 2 Ulster Wildlife, Belfast, UK, 3 Forschungsinstitut und Naturmuseum Senckenberg, Frankfurt am Main, Germany Seasonal measurements of the metabolic physiology of four Antarctic demosponges and their associated assemblages, maintained in a flow through aquarium facility, demonstrated one of the largest differences in seasonal strategies between species and their associated sponge communities. The sponge oxygen consumption measured here exhibited both the lowest and highest seasonal changes for any Antarctic species; metabolic rates varied from a 25% decrease to a 5.8 fold increase from winter to summer, a range which was greater than all 17 Antarctic marine species (encompassing eight phyla) previously investigated and amongst the highest recorded for any marine environment. The differences in nitrogen excretion, metabolic substrate utilization and Edited by: Alberto Basset, tissue composition between species were, overall, greater than seasonal changes. The University of Salento, Italy largest seasonal difference in tissue composition was an increase in CHN (Carbon, Reviewed by: Hydrogen, and Nitrogen) content in Homaxinella balfourensis, a pioneer species in Angel Pérez-Ruzafa, ice-scour regions, which changed growth form to a twig-like morph in winter. The Universidad de Murcia, Spain Thanos Dailianis, considerable flexibility in seasonal and metabolic physiology across the Demospongiae Hellenic Centre for Marine Research, likely enables these species to respond to rapid environmental change such as ice-scour, Greece reductions in sea ice cover and ice-shelf collapse in the Polar Regions, shifting the *Correspondence: Simon A. Morley paradigm that polar sponges always live “life in the slow lane.” Great phenotypic plasticity [email protected] in physiology has been linked to differences in symbiotic community composition, and this is likely to be a key factor in the global success of sponges in all marine environments Specialty section: This article was submitted to and their dominant role in many climax communities. Marine Ecosystem Ecology, Keywords: seasonal physiology, paradigm shift, seasonal metabolism, Porifera, polar physiology, elemental a section of the journal composition, CHN, phenotypic plasticity Frontiers in Ecology and Evolution Received: 11 July 2015 Accepted: 31 December 2015 INTRODUCTION Published: 22 January 2016 Citation: The majority of marine ecosystems are seasonal, with significant annual variation in photoperiod, Morley SA, Berman J, Barnes DKA, and temperature leading to variation in food supply (Peck et al., 2006), particularly for suspension de Juan Carbonell C, Downey RV and feeders. This results in marked reductions in activity, growth, and reproduction of benthic Peck LS (2016) Extreme Phenotypic Plasticity in Metabolic Physiology of suspension feeders during periods of low food supply (Gruzov, 1977; Hughes, 1989; Fenchel, Antarctic Demosponges. 1990; Coma et al., 1998). These low food periods largely coincide with the coldest water Front. Ecol. Evol. 3:157. temperatures and at polar latitudes the seasonal difference in phytoplankton productivity is doi: 10.3389/fevo.2015.00157 amongst the highest of any ocean, whilst the shallow water temperature variation is amongst the Frontiers in Ecology and Evolution | www.frontiersin.org 1 January 2016 | Volume 3 | Article 157 Morley et al. Sponge Physiological Plasticity and Success lowest (Venables et al., 2013). Feeding, growth, and reproductive water, ash, and CHN content were compared between summer investment of primary consumers are therefore often coupled to and winter. This information is important for understanding the brief austral summer, with reduced feeding and metabolic the global success of sponges across aquatic habitats, predictions activity for several months during winter (Gruzov, 1977; Clarke, of the capacity of sponge communities to respond to climate 1988; Clarke et al., 1988; Morley et al., 2007). Whilst winter change, especially in the Antarctic (Meredith and King, 2005), dormancy in polar species is common, and can be extreme (e.g., through environmental warming, reductions in sea ice (Barnes Bryozoan; Barnes and Peck, 2005), in other, even closely related et al., 2014), break up of ice-shelves (Dayton et al., 2013; Fillinger species of suspension feeders, periods of reduced metabolic, et al., 2013), and any resultant changes in energy flow into the and feeding activity can be as short as 1 month (Barnes and benthic community (Post et al., 2007; Peck et al., 2010; Dayton Clarke, 1995). The patterns of seasonal physiology are therefore et al., 2013; Venables et al., 2013). complex and in groups such as carnivores, whose food supply is more consistent throughout the year, physiology is generally METHODS less coupled to the overlying seasonality and more closely linked to the timing of key life history events (Clarke et al., 1988; Species, with differing growth forms, were chosen to represent Obermüller et al., 2010). the dominant demosponge assemblage present in the sublittoral Sponges are a rich group of sessile invertebrates with over 8500 waters around Rothera Research station. No calcareous sponges described species which occur in almost every benthic aquatic were collected during subtidal surveys. Only two hexacinellid habitat (Van Soest et al., 2012). Approximately 400 sponge species (glass) sponges were observed during the subtidal surveys have been identified from the Southern Ocean (Janussen and and due to their large size they were excluded from this Downey, 2014), where they can be dominant components of study. Sponges and/or sections of, Axinella antarctica (Koltun, Antarctic shelf communities (Dayton et al., 1970, 1974; Voss, 1964), Calyx arcuarius (Topsent, 1913), Clathria (Axosuberites) 1988; Barthel, 1995). Their high biomass and morphological nidificata (Kirkpatrick, 1907), Dendrilla antarctica (Topsent, diversity are believed to be important in maintaining and 1905), Hemigellius sp., Homaxinella balfourensis (Ridley and structuring Antarctic benthic diversity (Gutt and Schickan, 1998; Dendy, 1886), Isodictya kerguelenensis (Ridley and Dendy, 1886), Cocito, 2004; McClintock et al., 2005). The efficient filter feeding Mycale (Oxymycale) acerata (Kirkpatrick, 1907), Phorbas sp., of sponges makes them important components of the nutrient Sphaerotylus antarcticus (Kirkpatrick, 1907), and Suberites sp., cycles of many marine ecosystems (Diaz and Ward, 1997; Diaz were collected by SCUBA divers from depths of 20–30 m in and Rutzler, 2001), as they perform an important role in bentho- Ryder Bay, West Antarctic Peninsula (67◦ 34′S, 68◦ 07′W). pelagic coupling, transferring energy, and carbon from pelagic to Sponges were maintained in the British Antarctic Survey’s flow benthic ecosystems (Gatti, 2002). Sponges can utilize a variety through aquarium at Rothera Research Station and identified of food sources, including picoplankton, such as bacteria and utilizing the standard protocols to examine skeletal architecture viruses within the water column (Hadas et al., 2009; Perea- and measurement of spicule types (Boury-Esnault and Ruetzler, Blázquez et al., 2013a). Despite this wide range of food types, 1997). Sponges for physiology were cut into approximately in many environments sponge physiology often varies seasonally equally sized sections, with oscules and ostia present, before being with environmental temperature (Fromont, 1994; Witte et al., left to recover for at least 1 week so that any increase in metabolic 1994; Fan and Dai, 1999; Meroz-Fine et al., 2005; Perea-Blazquez rate caused by regeneration was minimized. Regeneration was et al., 2013b). Growth can also vary seasonally (Harsha et al., considered complete after effective closure of the ectosome by 1983) and food availability has been shown to influence seasonal pinacocytes. Sponges were kept in the flow through aquarium reproductive cycles (Witte, 1996). system for 12 months and any morphological seasonal variation Whilst sponges are considered suspension feeders, they are was recorded qualitatively for each species. Temperature and often associated with complex biomes containing bacterial photoperiod in the aquarium were adjusted to match that of the communities which supplement their nutrition (Vacelet, 1971; natural environment, although temperature was approximately Wilkinson, 1978; Weisz et al., 2007). These bacterial communities 0.2◦C warmer. Sponges can contain a wide variety of bacteria can occupy a large proportion, up to 40%, of the mesohyl (Weisz et al., 2008), which may influence metabolic rates (Weisz volume (Vacelet, 1975; Wilkinson, 1978) and can be a mixture of et al., 2007) and, therefore, the samples were considered as a cyanobacteria or heterotrophic bacterial populations (Wilkinson, whole community, including the sponge biome. 1978) including those that have nitrification (Bayer et al., 2008) The metabolic rate, nitrogenous waste production, and CHN or sulfate reduction (Erwin et al., 2012) capacities, which are content of sponge biomes were measured in both summer and consistently associated with particular species (Webster et al., winter. Before metabolic rate was measured any visible macro-
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